KR20090067838A - A device for removimg the sticking of molten steel on lance of converter - Google Patents

Abstract

A device for conveniently removing molten steel stuck on an oxygen lance of a converter is provided to simplify the removing of molten steel from the surface of an oxygen lance excessively and reduce the removing time thereof. A device for conveniently removing molten steel stuck on an oxygen lance of a converter includes a plurality of separative tubes(4) detachably secured to a nozzle part of an oxygen lance(3) and clamping rods(8) for fixing the separative tubes.

Description

Oxygen lance attachment removal device {A DEVICE FOR REMOVIMG THE STICKING OF MOLTEN STEEL ON LANCE OF CONVERTER}

The present invention relates to an oxygen lance now attachment removal device for converters, and more particularly to an apparatus for preventing and removing the attachment to the oxygen lance for injecting a high pressure, high flow of oxygen during the converter blow process during the steelmaking process.

As shown in FIG. 1, in order to oxidize and remove carbon, silicon, phosphorus, and the like, which are usually included in molten iron during the converter blowing during the steelmaking process, high pressure and high amount of oxygen are injected through the oxygen lance 3.

The oxygen lance (3) is composed of a steel pipe of a triple structure to withstand high temperatures, the gas is supplied to the center and the cooling water flows out.

The high pressure oxygen jet sprayed through the oxygen lance 3 hits the surface of the melt to scatter large amounts of molten iron and converter slag, and the scattered molten iron and converter slag adhere to the surface of the oxygen lance to solidify or flow.

In the attached molten iron and converter slag, although the converter slag is attached to the oxygen lance (3), it is easy to separate from the oxygen lance (3) by being peeled off during the cooling process after the blow. However, in the case of molten iron, not only is it difficult to separate once it is attached to the oxygen lance (hereinafter referred to as "now"), but also once attached to the oxygen lance (3), it is easier to attach the molten iron to the next use and the number of times of use of the oxygen lance As is increased, the adhesion amount now increases and eventually the oxygen lance 3 cannot be used.

Approaches for preventing the adhesion of oxygen to the lance now include a method of suppressing the scattering of molten iron or slag or preventing the molten iron or slag from adhering to the surface of the oxygen lance.

In the former case, the oxygen flow rate, the shape of the nozzle, the distance from the hot water surface, and the like may be achieved to some extent, but it is virtually impossible to completely suppress the scattering itself as long as oxygen is injected.

In the latter case, the oxygen lance surface is prevented from adhering to the surface of the oxygen lance by increasing the cooling capacity of the oxygen lance to reduce the surface temperature, thereby suppressing quenching or changing the physical properties of the lance surface. There is a way.

To increase the cooling capacity, the thickness of the pipe outside the oxygen lance can be increased to increase the heat conduction effect of the cooling water or to increase the cooling water flow rate by increasing the capacity of the cooling water pump. The adhesion inhibitory effect also has a problem that is not satisfactory.

As a method of changing the surface properties of oxygen lance, there is a method of applying ceramic-based refractory components (alumina, boron, silica, etc.) on the surface, and chrome coating is performed to form a thin film on the surface of the chrome lance. (離 型 性) can increase.

However, since the length of the oxygen lance is 20m or more, not only the chromium coating itself is easy, but there is a disadvantage in terms of cost even when specially manufactured.

Unlike these methods, there is a method of forming a thin film by simply applying a release product and then drying, but since the interfacial strength between the oxygen lance envelope and the release product is weak, peeling is easily generated, and thus it is not a satisfactory method.

In addition to these methods, there is a device that installs a mechanical device on the oxygen lance dome and scrapes the current attached when the oxygen lance is raised. However, once molten iron is sintered, it is almost ineffective and only scratches can be easily scratched. .

In order to solve the above problems, an object of the present invention is to provide an oxygen lance now attachment removal device that is attached to the outer surface of the oxygen lance by forming a molding device composed of a metal or ceramic material to prevent the adhesion, and now easy to remove. .

In order to achieve the above object, the present invention is characterized in that it comprises a plurality of removable tube seated on the oxygen lance nozzle portion and a clamping rod for fixing the release tube.

The release tube is divided into a first half cylinder and a second half cylinder and has a cylindrical shape when mutually coupled, wherein the first half cylinder and the second half cylinder have a clamping hole through which a clamping rod is formed, and a cut surface has an uneven shape. It features.

Oxygen lance now attachment prevention device of the present invention has the effect of enabling efficient operation by facilitating the operation to remove the current that is excessively attached to the surface of the oxygen lance hindering operation and shortening the working time.

Hereinafter, with reference to the accompanying drawings will be described in detail.

Figure 2 shows a perspective view and a cross-sectional view of the A-A 'portion of the release tube in the present invention, Figure 3 is a perspective view when the release tube is separated into a first half cylinder and a second half cylinder, Figure 3 is an oxygen lance now attached to the present invention Vertical cross-sectional view when the removal device is attached to an oxygen lance.

The present oxygen lance attachment and removal device includes a plurality of detachable release tubes 4 and a clamping rod 8 for fixing the release tubes 4.

The release tube (4) is cast by mixing boron nitride and alumina, which is widely used as a release agent because of its excellent corrosion resistance and releasability, so that the now (9) is slightly attached to the surface of the release tube and can be easily removed (9). By molding.

The inner diameter of the release tube 4 should be processed to 0.5 mm or more than the outer diameter of the oxygen lance, the height is 10 cm ~ 1 m, the thickness is made to be 5 mm or more.

The release tube 4 consists of a first semicircle 5 and a second semicylinder 6.

Clamping holes 7 are formed in the first and second semi-cylinders 5 and 6 so that two clamping rods 8 can be fixed therethrough. Concave-convex in order to match and have a good bond. When the first and second half cylinders 5 and 6 are coupled to each other, a cylindrical shape is formed to surround the oxygen lance.

The clamping rod 8 is for fixing a plurality of release tubes. The clamping rod 8 is a cylindrical rod, and the length 10 is preferably 11 m or more since the now 10 is scattered about 10 m upward from the nozzle portion of the oxygen lance in the converter 1.

 Below is a look at the state of use of the oxygen lance now attachment removal device.

As shown in FIG. 4, after the release tube 4 is seated on the nozzle part of the oxygen lance formed in the shape of a wing, the release tube 4 having a predetermined size is aligned with the clamping hole 7 so as to coincide with the oxygen lance. Install until it is about 10m from the nozzle part.

In order to fix the plurality of release tubes, a clamping rod 8 is inserted into the clamping hole 7 at the top so that the pipe is generally circular in shape.

 When the current is attached to the surface of the release tube by repeatedly converting the converter, the clamping rod 8 is detached and the plurality of release tubes 4 are separated to remove the now 9 and then oxygen lance now. Install the attachment removal device.

If the release tube (4) is broken or now (9) does not fall, install another replacement tube (4).

Figure 1 shows the converter and the oxygen lance used in the converter blowing process of the steelmaking process.

Figure 2 shows a perspective view and a cross-sectional view of the AA 'portion of the release tube.

3 is a perspective view when the release tube is separated into a first half cylinder and a second half cylinder.

Figure 4 is a vertical cross-sectional view of the oxygen lance now attached to the present invention is attached to the oxygen lance is attached to the lance.

* Explanation of symbols for main parts of the drawings

1: converter 2: array boiler cooler

3: oxygen lance 4: release tube

5: first semicylinder 6: second semicylinder

7: clamping hole 8: clamping rod

9: now

Claims (3)

A plurality of detachable release tubes mounted on the oxygen lance nozzle unit; Oxygen lance attachment and removal device including a clamping rod for fixing the release tube. The method of claim 1, The release tube is divided into a first half-cylinder and a second half-cylinder, the oxygen lance attachment and removal device, characterized in that it has a cylindrical shape when mutually coupled. The method of claim 2, The first half cylinder and the second half cylinder is formed with a clamping hole through which the clamping rod penetrates, the cutting surface is oxygen lance attachment and removal apparatus, characterized in that the irregular shape.

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